hppa: Revise REG+D address support to allow long displacements before reload
[official-gcc.git] / gcc / ada / cstreams.c
blobbc527b58628052a07bae207af3c05494d9b638ed
1 /****************************************************************************
2 * *
3 * GNAT RUN-TIME COMPONENTS *
4 * *
5 * C S T R E A M S *
6 * *
7 * Auxiliary C functions for Interfaces.C.Streams *
8 * *
9 * Copyright (C) 1992-2023, Free Software Foundation, Inc. *
10 * *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. *
17 * *
18 * As a special exception under Section 7 of GPL version 3, you are granted *
19 * additional permissions described in the GCC Runtime Library Exception, *
20 * version 3.1, as published by the Free Software Foundation. *
21 * *
22 * You should have received a copy of the GNU General Public License and *
23 * a copy of the GCC Runtime Library Exception along with this program; *
24 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
25 * <http://www.gnu.org/licenses/>. *
26 * *
27 * GNAT was originally developed by the GNAT team at New York University. *
28 * Extensive contributions were provided by Ada Core Technologies Inc. *
29 * *
30 ****************************************************************************/
32 /* Routines required for implementing routines in Interfaces.C.Streams. */
34 #ifndef _LARGEFILE_SOURCE
35 #define _LARGEFILE_SOURCE
36 #endif
37 #define _FILE_OFFSET_BITS 64
38 /* the define above will make off_t a 64bit type on GNU/Linux */
40 /* Tell Cygwin's <stdio.h> to expose fileno_unlocked() */
41 #if defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(_GNU_SOURCE)
42 #define _GNU_SOURCE
43 #endif
45 #include <stdio.h>
46 #include <sys/types.h>
47 #include <sys/stat.h>
48 #include <unistd.h>
49 #include <stdlib.h>
51 #ifdef _AIX
52 /* needed to avoid conflicting declarations */
53 #include <unistd.h>
54 #include <sys/mman.h>
55 #endif
57 #ifdef __vxworks
58 #include "vxWorks.h"
59 #endif
61 #ifdef IN_RTS
62 #include <string.h>
63 #else
64 #include "config.h"
65 #include "system.h"
66 #endif
68 #include "adaint.h"
70 #ifdef __cplusplus
71 extern "C" {
72 #endif
74 #ifdef __linux__
75 /* Don't use macros on GNU/Linux since they cause incompatible changes between
76 glibc 2.0 and 2.1 */
78 #ifdef stderr
79 # undef stderr
80 #endif
81 #ifdef stdin
82 # undef stdin
83 #endif
84 #ifdef stdout
85 # undef stdout
86 #endif
88 #endif
90 /* Don't use macros versions of this functions on VxWorks since they cause
91 imcompatible changes in some VxWorks versions */
92 #ifdef __vxworks
93 #undef getchar
94 #undef putchar
95 #undef feof
96 #undef ferror
97 #undef fileno
98 #endif
101 __gnat_feof (FILE *stream)
103 return (feof (stream));
107 __gnat_ferror (FILE *stream)
109 return (ferror (stream));
113 __gnat_fileno (FILE *stream)
115 return (fileno (stream));
118 /* on some systems, the constants for seek are not defined, if so, then
119 provide the conventional definitions */
121 #ifndef SEEK_SET
122 #define SEEK_SET 0 /* Set file pointer to offset */
123 #define SEEK_CUR 1 /* Set file pointer to its current value plus offset */
124 #define SEEK_END 2 /* Set file pointer to the size of the file plus offset */
125 #endif
127 /* if L_tmpnam is not set, use a large number that should be safe */
128 #ifndef L_tmpnam
129 #define L_tmpnam 256
130 #endif
132 int __gnat_constant_eof = EOF;
133 int __gnat_constant_iofbf = _IOFBF;
134 int __gnat_constant_iolbf = _IOLBF;
135 int __gnat_constant_ionbf = _IONBF;
136 int __gnat_constant_l_tmpnam = L_tmpnam;
137 int __gnat_constant_seek_cur = SEEK_CUR;
138 int __gnat_constant_seek_end = SEEK_END;
139 int __gnat_constant_seek_set = SEEK_SET;
141 FILE *
142 __gnat_constant_stderr (void)
144 return stderr;
147 FILE *
148 __gnat_constant_stdin (void)
150 return stdin;
153 FILE *
154 __gnat_constant_stdout (void)
156 return stdout;
159 char *
160 __gnat_full_name (char *nam, char *buffer)
162 #ifdef RTSS
163 /* RTSS applications have no current-directory notion, so RTSS file I/O
164 requests must use fully qualified path names, such as:
165 c:\temp\MyFile.txt (for a file system object)
166 \\.\MyDevice0 (for a device object)
168 if (nam[1] == ':' || nam[0] == '\\')
169 strcpy (buffer, nam);
170 else
171 buffer[0] = '\0';
173 #elif defined (__MINGW32__)
174 /* If this is a device file return it as is;
175 under Windows NT a device file ends with ":". */
176 if (nam[strlen (nam) - 1] == ':')
177 strcpy (buffer, nam);
178 else
180 char *p;
182 _fullpath (buffer, nam, __gnat_max_path_len);
184 for (p = buffer; *p; p++)
185 if (*p == '/')
186 *p = '\\';
189 #elif defined (__FreeBSD__) || defined (__DragonFly__) || defined (__OpenBSD__)
191 /* Use realpath function which resolves links and references to . and ..
192 on those Unix systems that support it. Note that GNU/Linux provides it but
193 cannot handle more than 5 symbolic links in a full name, so we use the
194 getcwd approach instead. */
195 realpath (nam, buffer);
197 #elif defined (__vxworks)
199 /* On VxWorks systems, an absolute path can be represented (depending on
200 the host platform) as either /dir/file, or device:/dir/file, or
201 device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
202 to verify it. */
204 int length;
206 if (__gnat_is_absolute_path (nam, strlen (nam)))
207 strcpy (buffer, nam);
209 else
211 length = __gnat_max_path_len;
212 __gnat_get_current_dir (buffer, &length);
213 strncat (buffer, nam, __gnat_max_path_len - length - 1);
216 #else
217 if (nam[0] != '/')
219 char *p = getcwd (buffer, __gnat_max_path_len);
221 if (p == 0)
223 buffer[0] = '\0';
224 return 0;
228 /* If the name returned is an absolute path, it is safe to append '/'
229 to the path and concatenate the name of the file. */
230 if (buffer[0] == '/')
231 strcat (buffer, "/");
233 strcat (buffer, nam);
235 else
236 strcpy (buffer, nam);
237 #endif
239 return buffer;
242 #ifdef _WIN32
243 /* On Windows we want to use the fseek/fteel supporting large files. This
244 issue is due to the fact that a long on Win64 is still a 32 bits value */
245 __int64
246 __gnat_ftell64 (FILE *stream)
248 return _ftelli64 (stream);
252 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
254 return _fseeki64 (stream, offset, origin);
257 #elif defined (__linux__) || defined (__sun__) || defined (__FreeBSD__) \
258 || defined (__APPLE__)
259 /* section for platforms having ftello/fseeko */
261 __int64
262 __gnat_ftell64 (FILE *stream)
264 return (__int64)ftello (stream);
268 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
270 /* make sure that the offset is not bigger than the OS off_t, if so return
271 with error as this mean that we are trying to handle files larger than
272 2Gb on a patform not supporting it. */
273 if ((off_t)offset == offset)
274 return fseeko (stream, (off_t) offset, origin);
275 else
276 return -1;
279 #else
281 __int64
282 __gnat_ftell64 (FILE *stream)
284 return (__int64)ftell (stream);
288 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
290 /* make sure that the offset is not bigger than the OS off_t, if so return
291 with error as this mean that we are trying to handle files larger than
292 2Gb on a patform not supporting it. */
293 if ((off_t)offset == offset)
294 return fseek (stream, (off_t) offset, origin);
295 else
296 return -1;
298 #endif
300 /* Returns true if the path names a fifo (i.e. a named pipe). */
302 __gnat_is_fifo (const char* path)
304 /* Posix defines S_ISFIFO as a macro. If the macro doesn't exist, we return
305 false. */
306 #ifdef S_ISFIFO
307 struct stat buf;
308 const int status = stat(path, &buf);
309 if (status == 0)
310 return S_ISFIFO(buf.st_mode);
311 #endif
313 /* S_ISFIFO is not available, or stat got an error (probably
314 file not found). */
315 return 0;
318 #ifdef __cplusplus
320 #endif